Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 36 for “"Mountain building"”.
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The Mechanics of Active Faulting and Mountain Building
… investigate the influence of fault rheology on mountain building. The first chapter studies the postseismic deformation following the 2003 Bam earthquake in south-eastern Iran, with the intention of probing the material properties of the fault zone. Measurements of ground deformation following …
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Dynamic links between short-term deformation and long-term tectonics: a finite element study
… accumulation of plastic strain that leads to mountain building. In Cascadia, I showed that the critical condition for producing permanent crustal shortening, hence mountain building, is for the plastic yield strength of the plate interface to be higher than that of the overriding plate. Strong …
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Long-term exhumation of landscapes along the Pacific-North American plate boundary as inferred from apatite (U-Th)/He and ArcGIS analyses
… detailed case studies. The northern San Gabriel Mountains along the San Andreas fault and the Chugach-Kenai Mountains above the Aleutian subduction zone are located along highly tectonically active sections of the Pacific-North American plate boundary and have not been studied from the context of …
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Tectono-hydrothermal evolution of the Neoarchean Abitibi greenstone belt, Canada
… formed in response to a period of Neoarchean mountain building and crustal thickening. To better constrain the depositional setting of the Timiskaming assemblage, high-resolution lithofacies mapping was conducted on key outcrops. The mapping highlights the presence of graywacke turbidite …
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U/Pb Zircon Ages of Plutons from the Central Appalachians and GIS-Based Assessment of Plutons with Comments on Their Regional Tectonic Significance
… tectonics, where multiple episodes of mountain building and rifting from the pre-Cambrian to the present are preserved in the geologic record. These orogenic events produced plutonic rocks, which can be used as probes of the thermal state of the source region. SIMS (secondary ion mass …
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EMPLACEMENT OF THE DADEVILLE COMPLEX OF THE SOUTHERNMOST INNER PIEDMONT WITHIN THE 7.5 MIN. CUSSETA QUADRANGLE, CHAMBERS COUNTY, ALABAMA: CHANNEL FLOW, KLIPPE KINEMATICS, OR OROGEN PARALLEL TRANSLATION
<p>The Appalachian Mountains have a complex geologic history spanning three orogenic periods, the Taconic, the Acadian/Neoacadian, and Alleghanian orogenies. The Inner Piedmont of the Appalachian Mountains within Alabama contains two distinct lithologic complexes, the Dadeville Complex, and the …
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Neogene seismotectonics of the south-central Chile margin : subduction-related processes over various temporal and spatial scales
… Andean orogen is the most outstanding example of mountain building caused by the subduction of oceanic below continental lithosphere. The Andes formed by the subduction of the Nazca and Antarctic oceanic plates under the South American continent over at least ~200 million years. Tectonic and …
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Cenozoic foreland-basin evolution in the northern Andes : insights from thermochronology and basin analysis in the Eastern Cordillera, Colombia
… to provide the first comprehensive account of mountain building and related foreland basin sedimentation in this part of the orogen, and to assess as to what extent pre-existent basement anisotropies have conditioned the locus of foreland deformation in space and time. In the Medina Basin, …
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Paleoenvironmental Reconstruction of an Upper Ordovician Rocky Shoreline: The Lindsay Formation of Heywood and Partridge Islands, Ontario
… during the Late Ordovician. During this time, mountain building processes associated with the Taconic Orogeny were taking place to the present east, and the tectonic effects of this orogeny resulted in subsidence of the Michigan Basin. The Lindsay Formation of the Trenton Group was deposited in …
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Regional Deformation and Dynamic Processes of the Southern Puna Plateau, Central Andes
… in orogenic models for non-collisional mountain belts, (2) test Earth’s upper-crustal responses to lower lithospheric processes, and (3) explore uses of low-temperature thermochronology in studying landscape evolution. This thesis provides important constraints on regional deformation …
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Late quaternary climate changes and landscape evolution in the Northwest Himalaya : geomorphologic processes in the Indian Summer Monsoon Domain
… zone provides a spectacular example of active mountain building and climatic forcing. In order to quantify the critically important process of mass removal, I analyzed spatial and temporal precipitation patterns of the oscillating monsoon system and their geomorphic imprints. I processed …
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Voltaire's Attitude Toward Geology
… accepted ideas on the origin of fossils and on mountain-building in the eighteenth century and explains Voltaire's reaction to these ideas, both in the context of his time and in the light of modern geology. He produced independent evidence that in the neighborhood of his residence at Ferney, on …
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Evolution of transient topography on passive margins: A study of landscape disequilibrium in the southern Appalachian Mountains
The mechanism through which the Appalachian Mountains have maintained moderate relief some ~300 Myr after the cessation of mountain building has long puzzled geomorphologists. As recent studies have shown that Appalachian exhumation has occurred at slow rates consistent with isostatic rebound of …
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Seismic investigations of the northern Transantarctic Mountains
… elevations of ~4500 m, the Transantarctic Mountains (TAMs) are the largest non-compressional mountain chain on Earth. The TAMs show no evidence of folding or reverse faulting as is typically seen in contractional mountain building, calling the origin of the mountain range into question. …
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Stratigraphic response to Cordilleran processes along the south central Andean margin
… components of Earth systems that link mountain building, magmatism, lithospheric dynamics, surface processes, and climate-carbon cycles. Resolving the feedbacks and relationships among these components has been a longstanding challenge in Earth science with broad implications for …
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Contractional tectonics : the Himalayan orogen and Perdido fold-thrust belt
… a reconstruction shows that Himalayan mountain-building processes are dominated by underplating. The Perdido fold-thrust belt is a gravity-driven toe structure in the passive margin of the Gulf of Mexico. Structural models for the Perdido fold-thrust belt are highly dependent upon the …
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SEISMIC VELOCITY, RADIAL ANISOTROPY IN THE CRUST AND UPPER MANTLE OF NORTHEASTERN TIBETAN PLATEAU FROM SURFACE WAVE TOMOGRAPHY
… Tibetan Plateau with complex interaction between mountain building and strike-slip faulting is a prime site to study the growth of the plateau and to understand the dynamic processes at its boundaries. This dissertation research investigates the crust and upper mantle structure in the NE Tibetan …
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A Lithic Raw Materials Study of the Bridge River Site, British Columbia, Canada
… because of their lighter rocks. They also caused mountain building and complex faulting and folding. They are the source of many different useful materials, some quite rare. Nephrite jade and steatite are some of the rare minerals common in the Bridge River area and are part of a groundstone …
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A Lithic Raw Materials Study of the Bridge River Site, British Columbia, Canada
… because of their lighter rocks. They also caused mountain building and complex faulting and folding. They are the source of many different useful materials, some quite rare. Nephrite jade and steatite are some of the rare minerals common in the Bridge River area and are part of a groundstone …
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Reduced modelling of mountains and ice sheets
The motion of rocks that make up mountains and of ice in glaciers and ice sheets can often be treated as a fluid flow. These geophysical systems are, however, very complex in terms of the rheology of their constituents and their interactions with environment. Simple mathematical models are often …
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